In 1937, 1,052 of his works were removed from German museums by the Nazis, more than by any other artist. 29 choice canvases were selected for the infamous exhibition of Degenerate Art; and no doubt many others were destroyed. In 1941 he was expelled from the Reichskunstkammer, the German Artists’ Association, and forbidden not just to exhibit or sell his work, but even to paint. However he continued creating art in secret, stockpiling hundreds of little watercolours, his “Unpainted…
